Fire alarm



J n 1952 s. KUZMICH, JR

FIRE ALARM Filed Sept. 14, 1949 I I Am I 0.. "inw I 6 3% 8 k 6m. Z nl dlyl M P 4 m;

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Stephen Kuzmich, Jr.

INVENTOR.

BY 2mm Patented June 10, 1952 FIRE ALARM Stephen Kuzmich, Jr., Bayonne, N. J assignor of thirty per cent to John Kuzmich, Bayonne,

Application September 14, 1949, Serial No. 115,676

This invention relates to fire alarms, and more particularly to a fire alarm system which, when placed in a large building or community, will indicate at a central station, the exact location of a An object of this invention is to provide a fire alarm system which will indicate at a central station the precise location of a fire or an area of excessive temperature.

Another object of this invention is to provide a unit which may be readily and easily installed in a removable manner in a fire alarm circuit, and which is simple in operation.

A further object is to provide an improved signal block having signal resistances which may be readily inserted in the block in a removable manner.

These, together with the various ancillary objects which will become apparent as the following description proceeds, are attained by this fire alarm, a preferred embodiment of which has been illustrated, by way of example only, in the accompanying drawing, wherein:

Figure 1 is an elevational view of the contact unit adapted to be inserted in the fire alarm system, which is shown with its insulated case in section;

Figure 2 is a perspective view of the signal block forming one element of the present invention;

Figure 3 is a circuit diagram showing the connections of the signal units in the circuit with the central station;

Figure 4 is a partial elevational view of a dial as at the central station; and,

Figure 5 is a perspective view, parts being broken away and shown in section to show other parts more clearly, of a signal resistance used in connection with the signal block of the present invention.

With continued reference to the accompanying drawing, wherein like reference numerals designate similar parts throughout the various views, l0 generally designates an insulated case in which the signal unit generally designated by reference numeral II is encased.

Journaled to one side wall of the insulated container I8 is a shaft I2 having a stop member l4 secured thereto and extending at right angles therefrom. Connected to the shaft is a means for inducing rotary motion thereto which may be a weight IE to which a cord or line l8 may be tied and thence connected to the shaft at its other end. The bimetallic thermostat 28 is secured to the case II! by means of a standard 3 Claims. (01. 177-358) 2 22 or other suitable mount. The stop I4 is adapted to be engaged by the thermostat 28 during. such times until the thermostat is bent downward and out of the way of the stop due to subjection to a temperature above a defined limit. Supports 24 and 26 are used to retain the shaft and support it.

Secured to the standard 26 is an arm 28 which has a brush 38 attached thereto. A connecting Wire 32 is secured to the brush and in turn, is connected to one of a pair of male prongs 34 and 36 which extend through a thickened portion 38 in the insulated case Ill. The brush 38 engages a slip ring 40 at the end of the shaft l2 to which a brush 42 is attached. The commutator brush or contact brush 42 engages the surface of the signal bar generally designated by reference number 44.

The signal bar 44 comprises a front plate having a core 46 and a plurality of sections connected to the core in annularly spaced relationship such as those designated by reference numeral 48, 50, 52, 54 and 56. The core and sections of the front plate are made of an insulative material. A rear plate 58 is secured to the front plate and is much thinner than the thickened front plate. By means of a screw GO'extending through the case III the plates 44 and 58 are held in an abutting relationship. Securely'fastened to the front plate and the rear plate is a first conductor 62. A plurality of selected signal resistances as are indicated by reference numeral 64 are removably secured in the gaps left between the sections such as 58 and 52 and have their end plates 66 abutting against the rear plate 58. The rear plate is connected by conductor 68 to the prong 36.

Referring now more particularly to Figure 5, it will be seen that the signal resistances comprise a pair of electrically conductive plates '10 and 66. Between these plates is interposed a selected resistance coil 12. An insulative top and sides such as those indicated by reference numeral 14 are used to complete the signal resistance elements. The resistance elements 12 of the signal resistances 64 are made in varying resistances. These resistances are so designed that they will reduce the voltage across the lines to anyone of ten voltages used to represent members in a circuit where there is an electric power source herein shown as a generator 8|, signal units l2 and a central station comprising a rheostat 16 and a voltmeter or galvanometer 18 positioned across the terminals of the line. A bell alarm 88 is also placed in circuit with the source resistance in the line to read a certain designated amount.

Each of the signal resistances 64 has a resistance 12 therein which will cause'a voltage read-" ing on the voltmeter corresponding to a numeral desired. Thusly, if a signal 're'sistance'is 'to" designate a numeral, as for example, '6, it will be of such magnitude as to cause a voltage'r'ead ing on the galvanometer with the indicator 84 thereon" reading the numeral 6 on the scale 86. Accordingly," when the brush rotate'd' over the surface of the" signal block, aftr "actuation and release by the thermostatic element 'ZOL- it will contact a variety and 'p'lurality of the-different signalresistances 6 4. As the brush contacts-the' resistances, the numerals on 7 the scale 85' will be successivelyindicated by the-pointer 84 acco'rdan'ce with the'magnitude of the resistances 12 ineachof the-signal resistances' 64. As these numbersr'eadmay be used toindicate the 'loc'a' tion of various areas to be protecteuyan'alarm designating the locationof a fire'may'be given.

advantages of this fire alarm are readily'ap parent, further description is'believedto"beun-" es e g ,v N However, since numerous modifications will readily occur 'to "those 'skilledin" the art after a consideration of the foregoingspec'ificationand accompanying drawings; it 'is 'not' intended tolimit the invention to the preciseembodimentof fire alarm'shown and described; but all modifica' tions and'equivalents maybe resorted to which fall within the'scope of the appended'claims;'

Having described the invention, what is claimed as newis:

1. A fire alarm system comprising a shaft, 2, stop member on said shaft; driv'e'meanssecured to said shaft, a thermostatically actuated member selectively retaining and "releasing said stop member; a contact brush operativ'elyengaging 'a signalblock comp'rising'a'fro'nt' plate of electrically'insula'tive material having'a core'and an-' nularly spaced sections, a rear plate of electrically conductive material" connecting means" holding said" plates together, resistance" elements insertable'b'etween'said annularly spaced sections in said-front platesan'd extending therebetweemsaid resistance elements includingspaced front and rear conductor'plates, selected resistance coils electrically connecting said conductors, electrically insulative top, bottom and side plates secured to said front and rear plates, a conductor connected to said core of said back plate, said conductor being connected in series to a voltmeter and to one terminal of a constant current source of power, said brush being electrically connected to the other terminal of said volt meter and source of power.

2. A fire alarm system comprising a power source, a support, a plurality of impedance elements of difiering impedance mounted on said support in fixed relation to each other and to said support, means electrically connecting one terniina'l of each of'said impedance elements to said source of power, a contact brush rotatably mounted on said support and movable to selectively and progressively contact the other terminal of each of said elements, means for rotating said brush, thermal responsive means for controlling rotation of said brush,'means' electrically connecting said brush to said source of power, and means in said system for indicating the relative magnitude of the impedance element, a shaft, said brush being carried by said shaft, said brush o t means includi a cord wound around said shaft and a weight on one end of said cord.

3. A fire alarm system comprising a power source, a support, a plurality of impedance elements of differing impedance mounted on said support in fixed relation to each other andto said support, means electrically connecting one terminal of each of said'impedance elements to V said source of power, a contact brush'rotatably mounted on said support and movable to selectively and progressively contact the other terminal of each of said elements, means for rotating said brush, thermal responsive means for controlling rotation of said brush, means electrically connecting said brush to said'source of power, and means in said system for indicating the relative magnitude of the impedance element; a shaft, said brush being carried by saidshaft, said brush rotating means including a cord wound around said shaft and a weight on one end of said cord, said thermal responsive means includinga unidirectionally yieldable finger on said shaft, and a thermal responsive elementnormally disposed in the path of travel of said finger and movable in response to a predetermined temperature out of the path of travel of said finger.

- STEPHEN KUZMICI-L'Jru REFERENCES orrEn The following references are of record in the file of this patent:-

UNITED STATES PATENTS Number Name Date 1 421,8 54- Bulen Feb. 18,1890 1,025,713 Nolen May 7, 1912 2,223,868 Graham Dec. 3, 1940 2,279,232 Graham Apr.'"7, 1942 2,285,969 Hempel 1 June '9, 1942 2,286,029 Van Beuren June -9, 1942 2,310,300 Leathers Feb. 9,1943 2,396,244 Borsum Mar. 12, 19% 

